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  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 反转单词顺序 -->
    <script>
      var reverseWords = function (s) {
        if (s == null || !s.length) return s
        let arr = s
          .split(' ')
          .reverse()
          .filter(item => item.trim().length > 0)
        return arr.join(' ')
      }
      console.log(reverseWords('the sky is blue'))
    </script>
  </body>
</html>
